@rna hi, are you sure that Huawei ec6108v9 have armv8 cpu?
AFAIK, it has hisilicon hi3798mv100 which is a armv7
Regarding Linux on this box, i have found on chinese forum, someone managed to install Ubuntu 16.04 using serial console and hitool. But the sad news is, it uses ancient kernel 3.10
Unfortunately, i cant try to install it on my box, because the file was uploaded at pan baidu, and i am outside of China mainland.
This box is actually very promising, because it has enough ram and emmc, and in my country, second hand from local telco will costs under usd 8